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How to identify a false acetabular in DDH:

It takes only 2 weeks for the infant's to form the secondary acetabulum,

which is a compensatory mechanism of the infant's body igned to stop the head coming out

of the primary acetabulum. proprioceptive receptors are responsible for the muscle tension

pressing the head to the articular surface.

Receptors that regulate this process are found ( more than in a knee joint).

Certain features may signal us that a secondary bushing has been created for transposition:

- acetabular shallow in proportion to the head or other joint;


-head distant from the acetabulum in the worse type;

-if during the ultarsound examination we see two different types of one joint (including

a dislocated at least D) that can be improved, ;

-Asymmetry in the visual to joints that is noticed during the conduct of a clinical examination and

cannot be corrected;

-different appearance of skin surface above hip joints; asymmetry in the protrusion of the groin

due to the displacement of the femur head.


if you have any doubt from 3 months old ; the X-ray examination is obligatory






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